The couple in this video (referred to only as Laura and Howard) have been married for 73 years, and singing their song the entire time. "You'll Never Know," originally recorded in 1943 by Alice Faye for the movie Hello, Frisco, Hello, is a wartime standard that won the Academy Award for Best Original Song, and would eventually be performed by everyone from Frank Sinatra to Barbra Streisand (it was the first song she ever recorded) to Michael Bublé.

This, according to Laura and Howard's granddaughter Erin Solari, was "the song that comforted [Laura] when [Howard] went away to fight in World War II," and remained "their song" all the way through their 50th anniversary, when they performed it as a duet after they renewed their wedding vows.